"Can I avoid having teeth out for my braces?" is the most common question an orthodontic consultation opens with. The answer depends on your teeth and your jaw, but there is a reason extraction comes up so often, and it is a fairly straightforward one.
Why crowded teeth happen at all
Our species eats what it eats. Early humans needed to tear and grind hard, tough food, and their jaws were correspondingly large. The modern diet is soft and processed, and it is often suggested that jaws became smaller over thousands of years.
Tooth count did not fall in step. The result is that for many people there is simply not enough room in the jaw for the full complement of teeth, which is the underlying cause of crowding, of the tooth that never manages to come through, and of the impaction of wisdom teeth.
Removing teeth to make space is therefore not a failure of nature so much as a way of resolving a mismatch that evolution set in motion. It is worth knowing that the teeth being removed are usually healthy. Nothing about a premolar being taken out for orthodontic reasons implies that it was diseased.
When extraction is genuinely needed
Crowding. Teeth cannot be brought into alignment without space to move into. This is the most common reason.
Protrusion. Where the front teeth stand forward of the lip line, extracting teeth creates the space to bring them back.
The teeth most often removed are the premolars, because removing them usually does not affect appearance and the space is positioned where the correction is needed. In specific cases, where a tooth is badly broken down and cannot be saved, a different tooth may be taken.
It is worth being clear on one point that is frequently misunderstood: the space left by the extracted teeth is usually closed during the treatment. The end result is normally a full arch. Function is usually not permanently affected, and chewing is usually not compromised, though this depends on the individual case.
When it is not needed
Extraction is not part of every orthodontic treatment, and plenty of cases are treated without it. It depends on the relationship between your teeth and your jaw, the severity of the crowding, the profile, and what you are trying to achieve.
Where the teeth are only mildly crowded, or where the jaw has room and the teeth are simply out of position, non-extraction treatment may be possible.
Two alternatives are sometimes discussed. Expansion — widening the dental arch to create space — works in suitable cases and avoids removal, but it is limited by bone, and pushing teeth beyond the envelope of the supporting bone carries its own risks. IPR, interproximal reduction, where a small amount of enamel is polished between teeth to make room, is useful for small degrees of crowding but is bounded by how much enamel can safely be removed.
These are legitimate techniques with real limitations, and a good orthodontist will explain honestly whether your case can be treated without extraction or cannot.
What to ask
Getting a second opinion is entirely reasonable for this, particularly if extraction is being proposed and you have not been told what the alternative would be.
Useful questions: what exactly is being extracted and why that tooth; could this be done without extraction; what happens to the space; how many teeth in total; and what would the result look like either way.
The decision is not one to make quickly, and a clear answer to why is a better indicator of a clinician's thinking than the price of the treatment.
If you are travelling for braces
Extraction, if it is part of the plan, needs to be sequenced properly relative to the orthodontic appointments. A tooth is usually better removed with enough time before orthodontic fitting or adjustment for initial healing and for the orthodontist to manage the space, rather than after the appliance has been planned. The exact timing should be decided by the treating orthodontist.
If you are travelling, ask the treating clinic to coordinate this in advance rather than having the extraction and the orthodontic appointment arranged independently.